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Mr. Morales’ MAS party has targeted Mr. Marincovic in the past. Last year, it circulated documents purporting to show that he worked with the U.S. State Department in an unsuccessful campaign to oust Mr. Morales in an August referendum.

MAS documents also sought to link Mr. Marincovic to U.S. Ambassador Philip Goldberg, and to link both to post-referendum violence that resulted in the deaths of 17 people.

Mr. Morales expelled Mr. Goldberg, accusing him of instigating a rebellion. The U.S. angrily denied the charge, expelled the Bolivian ambassador to Washington and froze dozens of bilateral development programs.

Mr. Marincovic, a Croat and Bolivian national, does not give telephone interviews, an aide told The Washington Times late last year.

But the Santa Cruz Civic Committee’s vice president, Luis Nunez, told The Times that the MAS claims were lies. “They say anything they want and never offer proof.”

“With all due respect, we have never received any money or other kinds of support from the United States,” Mr. Nunez said.

Mr. Costas, the governor of Santa Cruz province, this week called the latest campaign against Mr. Marincovic an attempt by Mr. Morales to create a pretext to round up activists who oppose his plans to nationalize much of Bolivia’s economy.

Mr. Morales is Bolivia’s first Indian president. His 2005 election reflected a national divide between the poorer indigenous population in the western highlands and the mestizo and European-descent residents of the more prosperous eastern lowlands.

Until Mr. Morales’ election, Easterners had dominated Bolivian politics.

Mario Cronnenbold, a member of the national assembly from Santa Cruz, said a cache of weapons linked to the purported assassination plot were “planted” by government agents.

Mr. Morales called on President Obama to condemn the assassination plot while he attended a weekend summit of hemispheric leaders in Trinidad.

“If he remains silent, I would have to assume that a conspiracy was hatched before the U.S. Embassy,” Mr. Morales told reporters at the summit.

Mr. Obama, commenting on the purported assassination plot, said Sunday his administration “absolutely opposed” the violent overthrow of any democratically elected government.

Police officials have said that Mr. Rosza and his group, which included another Hungarian, a Romanian, a Bolivian and an Irish national participated in last years violence.

Government investigators said that the group had been under surveillance for some months and it had been observed monitoring Mr. Morales at several public events to study his personal security.

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